package com.heima.wemedia.gateway.filter;

import com.heima.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

       if(request.getURI().getPath().contains("/login")) {
         return   chain.filter(exchange);
       }

        String token = request.getHeaders().getFirst("token");
       if(StringUtils.isBlank(token)){
           response.setStatusCode(HttpStatus.UNAUTHORIZED);
           return  response.setComplete();
       }

        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        int verifyToken = AppJwtUtil.verifyToken(claimsBody);
        if(verifyToken == 0 || verifyToken == -1){

            Long id = claimsBody.get("id", Long.class);

            ServerHttpRequest serverHttpRequest = request.mutate()
                        .headers(httpHeaders -> httpHeaders.add("userId", id.toString()))
                        .build();
                ServerWebExchange serverWebExchange = exchange.mutate().request(serverHttpRequest).build();
                return chain.filter(serverWebExchange);
        }else {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return  response.setComplete();
        }
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
